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Old 03-17-2014, 06:31 PM   #51 (permalink)
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Originally Posted by GoneNomad View Post
I'm not finding any RPMs to match up with those power and toque numbers anywhere... Not even from the horse's mouth.
Anybody else find them anywhere else (maybe somewhere else on Ford's website there's a press release or more detailed specs)?

The chart below compares the 2015 Ford F350 PowerStroke with both a 3.73 axle ratio and a 4.30 axle ratio to the current GM LML DMax (765 lb-ft) with a 3.73 axle ratio. It sure doesn't look like the Ford should need a 4.30 axle ratio. I'd be interested to see how much the Ford's margin of victory shrinks with a 3.73 axle ratio, especially from a rolling start that is more reflective of real-world conditions.
Looking at this chart will show exactly what I was talking about with gear and speed. With lower axle gears, it somewhat helps Ford's transmission gears, but not fully. If you were able to log torque sweet spots in rpm's, then you could figure at what speeds the trucks would pull the best in a given gear. Since Ford doesn't have a 1:1 ratio at all, it even makes comparing direct drive unequal. I suspect that Ford's transmission also eats more power in parasitic loss than the Allison, but that is just a guess. Also note that the 6.7 is available with some very tall axle gears also. How about a test with a 6.7 with some 3.20 axle gears towing heavy?

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Old 03-17-2014, 06:39 PM   #52 (permalink)
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Fourth gear @ DMax/Allison/3.73 (3.73) is very close to fifth gear @ 2015 PowerStroke/6R140/4.30 (3.698), less than 1% difference.

I didn't know Ford offered so many different axle ratios in their HD pickups, but I guess it's good they offer those options where GM does not.
It also means Ford has to spend more money EPA-certifying all those other combinations, too.
AFAIK, GM didn't offer 4.1 or lower gearing even in the Kodiaks, and maybe they should have considering that the Allison's first gear isn't all that low.
First gear in the 6L90 is much lower, at 4.027:1. In fact, all of the 6R140's ratios are similar to the 6L90, including top gear.

Of course, the wider the gearing, the larger the steps between gears without increasing the number of gears.

The 6L90 & 6R140 have a total ratio (first:sixth) of about 6:1, while the Allison is 5.08:1 (about 15% closer gear spacing on average).

I should think six speeds are plenty for a diesel truck that has a wide torque curve and should not need to achieve a high top speed either.

Last edited by GoneNomad; 03-17-2014 at 07:03 PM.
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